Mechanical anti-repeat control device



May 17, 1966. G. A. WILSON 3,251,965

MECHANICAL ANTI-REPEAT CONTROL DEVICE Filed Nov. 6, 1965 4 Sheets-Sheet 1 May 17, 1966 G. A. WILSON 3,251,965

MECHANICAL ANTI-REPEAT CONTROL DEVICE Filed Nov. e, 1963 4 Sheets-Sheet 2 INVENTOR. faf 1. Wa 6a/V May 17, 1966 Filed NOV. 6, 1965 G. A. WILSON MECHANICAL ANTI-REPEAT CONTROL DEVICE 4 Sheets-Sheet 5 INVENTOR @fa/Q65 ,4. @a .ra/v

4 Sheets-Sheet 4 Filed Nov. e, 1965 .rcs- 5..

3,251,965 MECHANCAL ANTI-REPEAT CONTROL DEVICE George A. Wilson, Media, Pa., assignor to I-T-E Circuit Breaker Company, Philadelphia, Pa., a corporation of Pennsylvania Filed Nov. 6, 1963, Ser. No. 321,856 7 Claims. (Cl. 20G-106) This invention relates to circuit breakers and more particularly to a mechanical anti-repeat control means for use in conjunction with circuit breaker closing assemblies, which operates to prevent apumping or repeating action to occur immediately after an opening operation when the energizing circuit for the closing operation has been completed at any time prior to the occurrence of the opening operation, thus requiring the closing circuit to be remade before the circuit breaker may be closed.

In circuit breakers having high current and voltage capacities, it is important that the closing operation occur at speeds which approach the speeds of the opening operation. This is due to the fact that as the cooperating contacts move to a position wherein they are in close proximity to one another, the voltage gradient across the contact surfaces is sufficient to cause a breakdown of the dielectric therebetween so as to form an arc drawn between the two contacts. The arcing condition causes a rapid deterioration of the surfaces of the cooperating contacts, thus severely affecting their useful operating lives. In addi-tion thereto, the cooperating contacts, together with the arc formed therebetween, frequently form a loop configuration which generates a magnetic field which, in turn, acts to produce a blow-open effect, thus acting against the closing force imposed upon the cooperating contacts, thereby impairing the effectiveness and swiftness of the closing operation.- Thus, it can be seen that it is quite important to provide a closing operation which is performed at substantially high speeds so as to minimize the chances of forming an arc between the closing contacts as .they approach one another.

In closing operations which are initiated by electronic means, it is possible that the electricalal circuit employed for the purpose of initiating the closing operation may be maintained in the closed condition for a period greater than `the time required for the entire' mechanical closing operation. This fact is quite obvious since the closing operation takes place during only a very brief portion of a second and it is possible that the electrical circuit for initiating the closing operation will remain energized for a period substantially longer than that which is required for the contacts to move to the fully engaged position.

In addition to the above, it is quite possible that the closing operation has been performed and that the electrical circuit or mechanical circuit for initiating a second closing operation may be performed acciden-tally during the time when the circuit breaker Iis already in the fully closed position. Such a follow-up operation is unnecessary and in addition thereto, may act to lhave harmful results to the circuit breaker which is already in the fully closed position. y

Prior art structures have introduced such anti-repeat functions in the circuit breakers by employing a relay controlsystem which normally requires three switches, or sets of contacts in order to carry out such functions. In addition thereto, a lockout coil is necessary in such prior art devices for the purpose of holding the closing coil circuit open until the closing circuit switch is opened.

The instant invention provides a mechanical arrangement for performing the anti-repeat functions, thus completely avoiding the necessity for utilizing the three switches and the one lockout coil needed in such prior art devices. This provides a simpler and more reliable operation and further, substantially decreases the complexity of l United States Patent O the electrical circuit employed for the purpose of performing the circuit breaker closing operation.

The instant invention is -comprised of a closing solenoid member having armature means for activating a counterbalance assembly. The counterbalance assembly is provided with a pivoting lever means which when initially activated engages the closing latch for the purpose of initiating the mechanical closing operation. Further movement of the trip lever causes it to pivot and disengage from the close latch so as to prevent any subsequent tripping thereof.

The circuit breaker movablebridge is pivotally connected to a rotatable jackshaft, which elements both undergo rotation during the closing operation. The rota-tion of the jackshaft causes a blocking lever which is mounted upon the jackshaft to block the solenoid armature in the energized posi-tion, thus preventing it from resetting even though it may become deenergized. The electrical circuit employed for energizing the closing coil is provided with a contact set which is mechanically controlled by the movable bridge carrying one of the cooperating contacts and is moved to the open position when the movable bridge rotates to the closed position, thus deenergizing the electrical circuit. If the closing coil switch is remade before the circuit breaker opens or if the closing coil switch remains closed when the circuit breaker opens, the movable bridge causes the contact set to remake the closing coil circuit before the solenoid armature is freed of the blocking action of the blocking lever, thus causing the closing solenoid to remain in the energized and disconnected position until the closing circuit is broken and remade for another closing operation.

Manual means are also provided for initiating the closing operation. The manual means are so arranged that actuation lthereof is defeated when the circuit breaker is closed. The contact set further provides the function of eliminating noise in the closing coil in the case of the maintain control circuit with the breaker in the closed position.

Further switch ymeans are provided for inserting resistance means into the electrical closing circuit to prevent the closing coil from overheating in cases where the cirl cuit breaker trips open and the electrical control circuit is either accidentally or deliberately maintained. The switch means is activated by a lever means secured to the closing coil plunger, thus causing the switch means to open and placing the resistance means in the electrical closing circuit, when the closing coil plunger is fully seated. It

should be noted that when the breaker is closed the re-4 sistance means is not in use since the circuit is 'broken anyway by the auxiliary contacts. The resistance comes into play only when the breaker trips open and the close switch has `been kept closed. The arrangement of the instant invention thereby provides a novel mechanical assembly for preventing a repetitive closing operation from occurring in cases Where the electrical closing circuit may be either accidentally or deliberately maintained in the energized condition and thereby avoiding the need for providing a plurality of control switches as employed in the prior art to perform such anti-repeat functions.

It is therefore one object of the instant invention to provide a novel mechanical anti-repeat assembly for preventing repetitive manual closing operations to occur during the time in which the circuit breaker contacts are in the closed condition.

Another object of the instant invention is to provide a novel mechanical anti-repeat device for circuit breakers and the like wherein novel means are provided for holding the closing coil plunger in the energized position when the circuit breaker cooperating contacts are closed to prevent subsequent operation of the closing coil.

Vbearing against a substantially L-shaped arm 29.

'vide a novel mechanical anti-repeat assembly for circuit breakers and the like wherein novel means are provided for disengaging the assembly trip lever from the circuit rbreaker close latch immediately after actuation thereof and for preventing re-engagement of the close latch by the trip lever when the circuit breaker cooperating contacts are closed. v

Still another object of the instant invention is to provide a novel mechanical anti-repeat assembly for use in circuit Ibreakers and the like wherein a blocking lever is provided for holding the closing coil plunger in the energized condition when the circuit breaker cooperating contacts are closed, thereby preventing the occurrence of subsequent closing operations until the circuit breaker is moved to the open position and the closing mechanism is reset.

Still another object of the instant invention is to provide a novel mechanical anti-repeat device for use in circuit breakers andl the like wherein manual means are provided for initiating the circuit breaker closing operations and having means for defeating the manual operated closing means when the circuit breaker cooperating contacts are closed or when the circuit breaker cooperating contacts are open and the closing assembly has not been reset.

These and other objects of the instant invention will become apparent when reading the accompanying description and drawings in which:

FIGURE l is an end view of a circuit breaker employing the mechanical anti-repeat assembly of the instant invention.

FIGURE 2 shows a side view of the circuit breaker of FIGURE l with the housing lthereof removed.

FIGURE 3 shows a portion of the circuit breaker -of FIGURE 2, showing the closing latch arrangement in greater detail.

FIGURE. 4 shows a portion of the arrangement of FIGURE 1 showing a portion of the mechanical anti-repeat `device in greater detail.

FIGURE 5 is a schematic diagram of the electrical closing coil circuit employed in the circuit breaker of FIGURES 1 4.

Referring now to the drawings and more particularly to FIGURE 2, there is shown therein a circuit breaker 10. While the speciic conguration of the circuit breaker described herein lends no specific novelty to the device of the instant invention, portions of the circuit breaker will be described herein to set the environment for the device of the instant invention and its interaction with the inventive structure.

The circuit breaker is provided with a movable bridge 11 pivoted at 12 and having main and arcing contacts 13 and 14, respectively. These contacts cooperate with the stationary main and arcing contacts .15 and 16, respectively. With the circuitbreaker in the closed position, the electrical path extends through the upper terminal 17, the tulip connector 18, circuit breaker conductive block 19, contact pairs 13-15 and 14-16, movable bridge 11, conductor block 20, tulip clip 21 and lower stationary terminal 22.

.i The movable bridge 11 is rotated under control of a connecting link 23, pivotally connected to bridge 11 at 24 .and to jackshaft 25 at 26. .The jackshaft 25 is pivoted to rotate about the hexagonal shaft 27. A closing spring 28 is wound about a shaft 29 and has its free end 28a The L-shaped arm 29 is provided with a rod 30 which bears against a rotating member 31 at its curved portion 31a.

With the L-shaped lever 29 in the solid line position, as shown in FIGURE 2, and when the closing spring is released, in a manner to be more fully described, the L-shaped lever 29 pivots counter -clockwise about shaft 29a, driving member 31 [which is also pivoted about shaft 29a] in the counterclockwise. direction. This drives the link 32 of the toggle linkage assembly from the dotted line position to the solid line position, shown in FIGURE 2, to rotate the jackshaft 25 from the dotted line position to the solid line position, shown in FIGURE 2. The toggle assembly is comprised of the connecting links 32 and 33, with link 32 being pivotally connected to member 31 at 34 and its other end being connected to link 33 at l35 and with the opposite end of link 33 being connected to jackshaft 25 at 26. The links 32 and 33 are held in their solid line position, as shown in FIGURE 2, by means 'of a member 37, which is pivoted at 38 and which has its opposite end 39 bearing against the knee 35 of the toggle linkage when the circuit breaker is in the closed position and which pivots about its pivot point 38 enabling the knee to collapse outwardly to the left to permit a tripping operation for the ci-rcuit breaker. This arrangement is a trip-free operation so that the circuit breaker may perform a tripping operation even during the time at which a closing operation is occurring, which feature has been embodied into prior art devices.

FIGURE l shows the mechanical anti-repeat assembly 40, which is incorporated into the circuit breaker structure-10. The structure 41D is comprised of a closing coil 41 having a cooperating plunger or armature 42. In the position shown in FIGURE l the plunger 42 is in the deenergized position. When the closing coil 41 is energized the plunger 42 moves downwardly in the direction shown by arrow 43 so that its lower surface 42a bear-s against the upper surface 44a of a stationary stop member 44. The intermediate portion of plunger 42 is provided with a pin 45 secured to a rotating member 46. The rotating member 46 in addition to being pivotally connected at 45 to plunger 42 is further connected by pin means 47 at its opposite end to a counterbalance member 48. The counterbalance member 48 is provided with an extending plunger pin conguration 48a at its lower extremity for the purpose of initiating a manual tripping operation.

The link 46 pivots about its intermediate portion by means of a pin 49 and is normally held in the position as shown in FIGURE 1 by means of a spring member 5t) which is affixed to a supporting bracket 51 at its lower end and which has its upper end bearing against the pin member45. Also, pivotally connected to pin 47 is a tripping lever 51 having a concave surface 51a at its lower end which cooperates with the upper end of a spring loaded pin within the counterbalance 48 so as to center the tripping lever 51 to occupy the position as shown in FIGURE l. The lower right-hand edge 511) of tripping lever 51 is provided for the purpose of pivoting the tripping lever 51 near the completion of the closing operation in a manner to be more fully described.

Assuming that a closing op-eration is to be performed, the closing coil 41 is energized by means ofk a suitable electrical circuit [not shown] causing the plunger 42 to move downwardly in the direction shown by arrow 43. This causes pin 45 to likewise move downwardly so as to pivot the member 46 clockwise about its pivot pin 49. This clockwise rotation of member 46 causes pin 47 to move upwardly in the direction shown by arrow 52 causing the upward end 51C of the tripping lever 51 to bear against the lower edge 53a of a closing latch 53.

After the upper edge 51e of trip lever 51 bears against the close latch 53 its extending portion 5112 bears against the pivot pin 49 causing it .to move to the dotted line position 51 shown in FIGURE l, thus moving the upper end of the trip lever 51 out of engagement with the close latch 53.

Referring now to FIGURE 3, the mechanical closing means 6i) is shown therein and is comprised of the close lat-ch 53 which is arranged to pivot about a shaft 61. The 'close latch is provided with a second extending arm 53a` the lower edge of which bears against a rst roller 62. Roller 62 is axed to an L- shaped member 63 by pin means 64. The L-shaped member 63 is arranged to pivot about a pin 65. Also affixed to L-shaped member 63 is a second roller member 66 affixed thereto by a pin 67. The surface of roller member 66 bears againsta shoulder 68a provided on a substantially annular member 68 which is arranged to pivot about a rectangular shaft 69. The annular member 68 is provided with a pin 70 which pivotally connects a link 71 thereto. The opposite end of link 71 is provided with 'a pin member 72 which ,bears against the free end 73a of a helical torsion type closing spring 73 which is wound about a shaft 74.

Assume the closing spring -73 to lbe fully charged so thatin order for the closing spring to discharge, it is urged in the clockwise direction about shaft 74 as shown by yarrow 76. The closing spring 73 is unable lto do so, due to the fact that pin 72 which -bears against its free end 73a prevents the discharge of the spring. However, upon clockwise rotation of trip latch 53 about its shaft- 61, as shown \by arrow 77, this causes the lower edge 53h of arm 53a to move out of engagement with roller member 62. This enables the free end 73a of spring means 73 to rotate in the clockwise direction as shown byfarrow 76 causing the pin 72 which it bears against to move substantially in that clockwise direction. This causes the annular member 68 to rotate counterclockwise yas shown by arrow 79 about the rectangular shaped shaft 69. This operation is permissible due to the fact that the roller member 62, which has been freed by arm 53a of .trip latch 53, permits the L- shaped member 63 to'pivot couuterclockwise about its pivot pin 65, as shown by arrow 80, enabling the shoulder 68a of annular member 68 to move roller 66 out of engagement with annular memiber 68 enabling the closing spring 73 to discharge and further moving pin 72 in the direction of movement of free arm 73a ofthe closing spring 73. v

Turning now to FIGURE 2, it can be seen that the dischargeof the helical closing spring 28 causes rotation of the arm 29 from its solid line position to a position pressing 'against member 31 in its solid line position, causing the links 32 and 33 of the toggle linkage arrangement to move to the solid line position of FIGURE 2, rotating jackshaft 25 clockwise about its shaft 27 and in turn, rotating movable bridge 11 counterclockwise about its pivot point 12 to bring theh contact pairs 14-16 and 13-15 into engagement.

Turning now to FIGURE 4, the jackshaft 25 is shown therein pivoted about the hexagonal shaft 27 which further acts to position and secure a rotatable blocking lever 85. The jackshaft 25 'of FIGURE 4 is shown in the position in which the movable bridge 11 of FIGURE 2 isin the open position. During a closing operation the jackshafty 25 rotates counterclockwise in FIGURE 4 as shown by the arrow 86, causing the jackshaft to move to a' substantially horizontal position, as shown in FIGURE 2. This'causes the blocking lever 85 to move from the solidline position of FIGURE 4 to the dotted line position 85 also shown in FIGURE 4,` thereby positioning its lower'arcuate surface 85a immediately above the upper edge 42a of plunger 42 which has moved downwardly due to the energization of the closing coil 41. Thus, with the circuit #breaker cooperating contacts in the closed position, the plunger 42 whether the closing coil 41 be energized or not, is held in the energized position by means of the blocking lever 85.. Thus, if any attempt is made to re-energize the closing coil circuit when the circuit breaker is in the closed position a closing operation is defeated due to the positioning of the blocking ylever 85.

Let it be assumed that a closing operation has just been performed. It is then possible at that time to fully charge the closing spring 73, shown in FIGURE' 3, which charging means may tbe any suitable means employed in the prior art, thus resetting the closing spring 73 to the fully charged position and causing a resetting of the annular member `68 and the link 71 to the position shown in FIGURE 3. This enables the close latch 53 to be reset which reset operation is performed by a torsion spring 87 which is positioned -about the shaft 61 and has one edge bearing against the close latch 53 and another end bearing against a stationary pin 88. This causes the close latch to move from the dotted line position 53 shown in FIGURE 3 to the solid line position 53, thererby causing the -arm 53a to have its lower edge 53h bear against roller 62 thereby resetting the entire closing mechanism which performs the closing operation.

Assuming a complete resetting of the closing mecha- -nism shown in FIGURE 3, it is now possible to energize the closing coil'to perform another high-speed closing operation. However, with the circuit breaker in the fully closed position, the closing coil plunger 42 is held in the energized position by means of blocking lever 85 and the trip lever 51 is held in the dotted line position 51 as shown in FIGURE l, thereby defeating any rattempt at a closing operation during the time in which the circuit breaker is already in the closed position.

If it is desired to perform a manually initiated closing operation, this is performed by' pushing the plunger 48a shown in FIGURE 1, upward in the direction shown by arrow 87. However, with the circuit breaker in the closed position, blocking lever 35 locks plunger 42 in the energized position and also holds the trip lever 51 upward and out of engagement with the close latch 53, preventing the occurrence of a closing operation.

Turning to FIGURE 5, there'is `shown therein a schematic diagram of the electrical circuit employed in the circuit breaker 10 of the invention. The arrangement ofFIGURE 5 is comprised of the movable bridge 11 which bears the contacts 13 and 14 which cooperate with the stationary contacts 15 and 16, respectively. Bridge 11 pivots about pin 12. The electrical circuit is comprised of the closing coil 41 which is in series With a contact set 90, a switch means 91, a suitable power source 92 and the closing switch means 93. The switch means 90 is mechanically linked with the movable bridge 11, represented schematically by the dotted line 94 and oper- .ates in such a manner that the contact set 90 is closed when the bridge 11 is in the open position land is open when the bridge is in the closed position. For example, let it be assumed that the movable bridge 11 is in the open position and that a closing operation is desired. The electrical closing switch 93 is initiated completing the closed loop circuit. This energizes closing coil 41 to operate the closing mechanism previously described. The closing mechanism causes the movable bridge 11 to move to the closed position, thus opening the contact set 90 which has the effect of deenergizing the closing coil 41.

is maintained and the breaker is moved to the open position, then the Contact set remakes the closing coil circuit of FIGURE 5 before the solenoid plunger 42 1s freed of the blocking action of blocking lever 85. This causes the closing solenoid plunger 42 to remain in the energized position until the closing circuit is broken and remade for another closing operation. Since the manual actuation of the closing latch is accomplished by pushing upon the extended end 48a of the counterbalance the closing springs 73 cannot be fired manually when the circuit breaker cooperating contacts are closed. The contact set 90 further serves the function of eliminating noise in the closing coil 41 in the case of a maintained control circuit when the breaker is in the closed position.

In order to prevent undue heating of the closing coil 41, if the circuit breaker trips open during the time that the control circuit of FIGURE is maintained, the closing coil plunger 42 is provided with a switch actuator arm 96 which can best be `seen in FIGURE l. The free end of the switch actuator arm 96 cooperates with the switch 91 which is also shown in FIGURE 1 such that when the closing coil plunger is held in the energized position the free end of actuator arm 96 bears against the arm 91a of switch 91 causing it to move to the open condition. This causes the resistance member 97 which is connected in parallel with switch 91 to be placed into the control circuit thereby diminishing the current flowing in the control circuit so as to prevent the closing coil 41 fromv overheating.

It can therefore be seen that the instant invention provides a mechanical anti-repeat arrangement which prevents repetitive closing operations once the circuit breaker cooperating contacts move to the closed position and further prevents a closing operation to occur immediately after a tripping operation has occurred and the electrical closing circuit has been maintained during the period in which the circuit breaker was tripped open. The mechanical anti-repeat arrangement is simple and reliable and further serves to alleviate the need for four contact sets in the electrical circuit as required in such prior art devices.

Although there has been described a preferred embodiment of this novel invention, many variations and modifications will now be apparent to those skilled in the art. Therefore, Vthis invention is to be limited, not by the specific disclosure herein, but only by the appending claims.

What is claimed is:

1. In a circuit breaker having a pair of cooperating -contacts and a normally latched closing means to rapidly 'plunger movable in a first direction when said closing coil is energized; a first arm pivotally mounted at a point intermediate its ends by suitable pin means; one end of said arm pivotally mounted to said plunger; a trip lever pivotally mounted to the other end of said first arm; said trip lever engaging and detaching said closing means to close said cooperating contacts when said closing coil is energized to move said plunger in said first direction; said trip lever having a projecting ear extending toward said pin means; said projecting ear abutting said pin means when said plunger is moved in said first directino to prevent said trip lever from engaging said closing 2. In a circuit breaker having a pair of cooperating contacts and a normally latched closing means to rapidly close said contacts, mechanical anti-repeat means comprising a normally deenergized closing -coil having a plunger movable in a first direction when said closing coil is energized; a first arm pivotally mounted at a point intermediate its ends by suitable pin means; one end of said arm pivotally mounted to said plunger; a trip lever pivotally mounted to the other end of said first arm; said trip lever engaging and detaching said closing means to close said cooperating contacts when said closing coil is energized to move said plunger in said first direction; said triplever having a projecting ear extending toward said pin means; said projecting ear abutting said pin means when said plunger is moved in said first direction to rotate said trip lever out lof engagement with said closing means;

3. ln a circuit breaker having a pair of cooperating contacts and a normally latched closing means to rapidly close said contacts, mechanical anti-repeat means comprising a normally deenergized closing coil having a plunger movable in a first direction when said closing coil is energized; a tirst arm pivotally mounted at a point intermediate its ends by suitable pin means; one end of said arm pivotally mounted to said plunger; a trip lever pivotally mounted to the other end of said first arm; said trip lever engaging and detaching said closing means to close said cooperating contacts when said closing coil is energized to move said plunger in said first direction; said trip lever having a projecting ear extending toward said pin means; said projecting ear abutting said pin means when said plunger is moved in said first direction to rotate said trip lever out of engagement with said closing means; rotatable lever means mechanically linked to said closing means; means mechanically coupling said contacts to said rotatable lever means for rotating said rotatable lever means in a first direction when said cooperating contacts are closing to lock said plunger in the energized position; and for rotating said rotating lever means in a second direction opposite said first direction to permit said plunger to move out of the energized position when said cooperating contacts are openedA 4. In a circuit breaker having a pair of cooperating contacts and a normally latched closing means to rapidly close said contacts, mechanical anti-repeat means comprising a normally deenergized closing coil having' a plunger movable in a first direction when said closing coil is energized; a first arm pivotally mounted at a point intermediate its ends by suitable pin means; one end of said arm pivotally mounted to said plunger; a trip lever pivotally mounted to the other end of said first arm; said trip lever engaging and detaching said closing means to close said cooperating contacts when said closing coil is energized to move said plunger in said first direction; said trip lever having a projecting ear extending toward said pin means; said projecting ear abutting said pin means when said plunger is moved in said first direction to rotate said trip lever out of engagement with said closing means; rotatable lever means mechanically linked to said closing means; said blocking lever means rotating in aiirst direction when said cooperating contacts are closing to lock said plunger in the energized position; said plunger holding said trip lever out of engagement with said closing means; manual closing means linked to said other end of said arm for manually delatching said closing means when said manual closing means is depressed.

5. In a circuit breaker having a pair of cooperating contacts and a normally latched closing mean-s to rapidly close said contacts, mechanical anti-repeat means comprising a normally deenergized closing coil having a plunger movable in a rst direction when said closing coil -is energized; a first arm pivotally mounted at a point intermediate its ends by suitable pin means; one end of said arm pivotally mounted to said plunger; a trip lever pivotally mounted to the other end of said first arm; said trip lever engagingand detaching said closing means to close said cooperating contacts when said closing coil is energized to move said plunger in said first direction; said trip lever having a projecting ear extending toward said pin means; said projecting ear abutting said pin means when said plunger i-s moved in said first direction to rotate said trip lever out of engagement with said closing means; rotatable lever means mechanically linked to said closing means; said blocking lever means rotating in a first direction when said cooperating contacts are closing to lock -said plunger in the energized position; said plunger holding said trip lever out of engagement with said closing p means; manual closing means linked to said other end of said arm for manually delatching said closing means when said manual closing means is depressed; said manual closing means being defeated when said blocking'lever means locks said plunger in said energized position.

6. In a circuit breaker having a pair of cooperating contacts and a normally latched closing means to rapidly close said contacts, mechanical anti-repeat means comprising a normally deenergized closing coil having a plunger movable in a first direction when said closing coil is energized; a first arm pivotally mounted at a point intermediate its ends by suitable pin means; one end of said arm pivotally mounted to said plunger; a trip lever pivotally mounted to the other end of said rst arm; said trip lever engaging and detaching said closing means to close said cooperating contacts when said closing coil is energized to move said plunger in said rst direction; a contact set connected in series with said closing coil; said contact set being mechanically linked to said closing coil plunger for opening said contact set when said closing coil plunger is held in the energized position and for closing said contact set when said closing coil plunger is in the reset position.

7. In a circuit breaker having a pair of cooperating contacts and a normally latched closing means to rapidly close said contacts, mechanical anti-repeat means comprising a normally deenergized closing coil having a plunger movable in a lirst direction when said closing coil is energized; a first arm pivotally mounted at a point intermediate its ends by suitable pin means; one end of said arm pivotally mounted to said plunger; a trip lever pivotally mounted to the other end of said rst arm; said trip lever engaging and detaching said closing means to close said cooperating contacts when said closing coil is energized to move said plunger in said first direction; a contact set connected in series with said closing-coil; said contact set being mechanically linked to said cooperating contacts for opening said contact set when said cooperating contacts are closed and for closing said contact set References Cited by the Examiner FOREIGN PATENTS A182,959 2/1907 Germany.

BERNARD A. GILHEANY, Primary Examiner. R. N. ENVALL, JR., Assistant Examiner. 

1. IN A CIRCUIT BREAKER HAVING A PAIR OF COOPERATING CONTACTS AND A NORMALLY LATCHED CLOSING MEANS TO RAPIDLY CLOSE SAID CONTACTS, MECHANICAL ANTI-REPEAT MEANS COMPRISING A NORMALLY DEENERGIZED CLOSING COIL HAVING A PLUNGER MOVABLE IN A FIRST DIRECTION WHEN SAID CLOSING COIL IS ENERGIZED; A FIRST ARM PIVOTALLY MOUNTED AT A POINT INTERMEDIATE ITS ENDS BY SUITABLE PIN MEANS; ONE END OF SAID ARM PIVOTALLY MOUNTED TO SAID PLUNGER; A TRIP LEVER PIVOTALLY MOUNTED TO THE OTHER END OF SAID FIRST ARM; SAID TRIP LEVER ENGAGING AND DETACHING SAID CLOSING 